Machine for forming hollow ware froivj paper-pulp



2 Sheets-Sheet 1.,

(No Model.)

J. G. BOD GE.

MACHINE FOR FORMING HOLLOW WARE PROM PAPER PULP.

nted June 2 1885.

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2 Sheets-Sheet 2.

(No Model.)

J. G. BODGE.

MACHINE FOR FORMING HOLLOW WARE FROM PAPER PULP. No. 319,182.

Patented June 2, 1885.

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JOSEPH G. BODGE, OF GORHAM, ASSIGNOR TO THE INDURATED FIBRE COMPANY, OFPORTLAND, MAINE.

MACHlNE. FOR FORMING HOLLOW WARE FROM PAPER-PULP.

SPECIFICATION forming part of Letters Patent No. 319,182, dated June 2,1885.

Application filed February 14, 1885. (No model.) Y

To all whom it may concern:

Be it known that I, JOSEPH G. BODGE, a citizen of the United States,residing at Gorham, in the county of Cumberland and State of Maine, haveinvented certain new and useful Improvements in Machines for FormingHollow XVa-re from Paper-Pulp, of which the following is aspecification, reference being had therein to the accompanying drawings.

My invention relates to machines for forming hollow ware frompaper-pulp; and it consists of an improved construction of my machinefor the same purpose, patented to me October 30, 1883, whereby saidmachine is rendered more efficient in its operation.

My invention consists, first, of a double dome or outside cylinder, thetwo parts having a space between them, and the inner being perforated;second, of a rubber diaphragm of thin dental rubber, made in onestraight piece and not molded to the form of the pail or other article,as in my former machine; third, of a check-valve or rubber flapsupplemented by a metal valve placed at the apertures where the pulpenters the machine to prevent the pulp from crowding back into theseapertures and packing them full when thepressure is applied.

I11 the drawings, Figure 1 is a vertical section through the line :0 a:of Fig. 2, showing a portion of the figure in elevation and otherportions cut away. Fig. 2 is a section through y y ofFig. l, withportion of the figure in plan. Fig. 3 is a detail showing constructionof die or former. Fig. 4t is an elevation of inner shell of former withgore of outer shell attached to it. Fig. 5 is a section through c a; ofFig. 4. Fig. 6 is an elevation showing manner of putting inner and outershells together. Fig. 7 is a cross-section through center of former whencomplete. Fig. Sis an enlarged section through z of Fig. 2. Fig. 9 is aperspective View showing manner of introducing stock. Fig. 10 is a planview of a portion of valve If.

A is the hollow cylinder or dome shown in my former patent. YVithin thedome A, and separated from it by the space or chamber P, is the innerdome, O. The dome 0 is perforated and lined on its inside with felt. The

two pipes c and a enter the chamber 1? through the top of dome A. Thepipe a, with its valve '12-, leads out from the inner face of the bottomof inner dome, O, and the inside opening of this pipe is covered withwire-gauze. The rubber diaphragm O is composed of a straight unmoldedpiece of thin rubber, its edges being confined between the edges of thering N and the ring 13. WVhen the former F is dropped down, thediaphragm C is stretched straight across on line 0 Fig. 1.

Z) bare the openings from the stock-chamber 12 into the space U, andbeneath the rubber diaphragm O. A valve-ring, b is-snnl; in the uppersurface of ring 13, running entirely around the ring 13, and havingholes or perforations b coincident with the openings b when valve b isin proper position. The valve-ring is slid in its seat by the stem S,having a crank, S, and pin S on its end, the latter of which fits in aslot in the under side of valve 5 The thin rubber ring or flapvalve T issecured, as to its outer edge, beneath the edge of diaphragm C, whileits inner edge is left free. The stiffening-piece t is attached to theflap-valve T over each of the holes If. The perforated former F is ofthree thicknesses, an inner shell, f, an outer shell, J, of thinnermaterial, and a covering or envelope, f, of wire-gauze. Two or moregores, f, are removed from the outer shell, f", and these gores aresecured to the inner shell, f. Their edges are beveled in such a mannerthat when the parts are together the gores f dovetail into the outershell, thus holding it firmly in place. The wire gauze f 4 envelops thewhole former, and it is soldered or otherwise secured to the outershell, J, at frequent intervals.

Having thus described the construction of my improved machine, I nowproceed to ex- ,plain its mode of operation. hen the form'- er F israised to its place, the diaphragm 0 assumes the position shown bydotted line 0". The valve b is now placed so that the holes I) coincidewith the holes b The pulp is then let in through chamber b, and as itcomes in it hits the flap-valve T. When the space U is full, it expandsthe diaphragm (3 back against the surface of the felt lining of theinner dome, O. The wire screenn over the end of the pipe it, preventsthe diaphragm G from being forced into the pipe. The valve c is openedduring this operation to allow the air to csparts of the diaphragm O.The diaphragm is thus forced inward toward the former F uniformly on allsides.

When the pail has been formed and is ready to be removed, the outershell, bearing with' it the wire-gauze and the formed article, isslipped from the inner shell. The sides of the outer shell are thensprung toward each other and the pail loosened and slipped off.

As thus constructed my former is capable of resisting the heavyhydraulic pressure without wearing out, as in the case of felt, and itcan be handled with great ease and the pail removed without breaking.

It was found upon trial that when the dia phragm O was expanded outagainst the inner surface of the dome A the water entering through thepipe a took some time to find its way down the sides between the rub berand the wall of the dome, and hence the top was pushed in more rapidlythan the sides, causing unevenness in the formation of the pail. The useof theinner dome does away with this difficulty. By the use of the thinrubber diaphragmamore even formation can be secured, because thediaphragm being straight and always in a state of tension adapts itselfreadily to the form of the article and does not form any folds.

The use of the valves T and b, I found to be quite necessary to theperfect working of the machine, because the apertures through which thepulp entered were liable to get clogged when the back-pressure was puton. Valve 1) may be turned with a worm-gear or other devices. In somecases where light hydraulic pressure is used valve b may be omitted.

I claim 1. In a machine for forming hollow ware from paper-pulp, aperforated inner dome, 0, arranged concentric with the outer dome, having space F between the two domes, the surface of inner dome beingcushioned or protected by felt or other suitable material, substantiallyas described.

2. Combination of straight rubber diaphragm O with valve T, with itsstiffeningpieces 16, substantially as shown and described.

3. The combination of straight rubber dia phragm O, flap-valve T, andvalve 22 operated by a stem, S, or other suitable means, substantiallyas shown and described.

4. The combination of the straight rubber diaphragm G with former madeup of inner shell, f, outer shell, f gores f and gauze f, substantiallyas shown and described.

5. The former composed of inner shell, f, with its goresf the outershell, f and wiregauze f substantially as described.

6. The flap-valve T, with its stiffening-pieces t, to stop back-flow ofpulp into pipes, substantially as shown.

7. The valve b with openings b connecting with ports b, and operated bystem S, with its crank S and pin S", substantially as described.

In testimony whereof I affix my signature in the presence of twowitnesses.

JOSEPH G. BODGE.

Witnesses:

FRANKLIN J. RoLLINs, EDWARD L. O. ADAMS.

